Based on the data Thomson collected in his experiments using cathode rays, the concept of atomic structure was modified. Which of the following statements about the atomic structure were validated by his cathode ray experiments?A. Cathode rays have mass.B. articles of the cathode rays are fundamental to all matter.C. Matter contains negative charge and by inference positive charge.D. There are subatomic size particles in an atom.
Based on the data Thomson collected in his experiments using cathode rays, the following statements about the atomic structure were validated:
A. Cathode rays have mass; B. Particles of the cathode rays are fundamental to all matter; C. Matter contains negative charge and by inference positive charge; and D. There are subatomic size particles in an atom.Thomson Data is a division of Thomson Reuters, a global provider of data and analytics solutions for professionals in the financial and risk, legal, tax and accounting, and media markets.
It provides access to a wide range of data sources and solutions including company data, market data, reference data, news and content, and financial services data. Thomson Data's services are used by businesses, investors, and other professionals to gain insights into the markets and make informed decisions. The company's solutions are designed to help organizations access, curate, and analyze data in order to drive better business outcomes.
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With an average acceleration of -5.6m/s2, how long will it take a driver to bring a truck with an initial speed of 10.3 m/s to a complete stop?
The number of miles that it will take a driver to bring a truck with an initial speed of 10.3 m/s to a complete stop will be 9.47 meters.
What is the motion in one dimension?One dimension denotes mobility in a single direction or in a straight line. Think of a vehicle travelling down a straight road or a person walking on a straight track. Imagine throwing something vertically into the air, then observing it fall.
With an average acceleration of -5.6 m/s². And the initial speed of 10.3 m/s to a complete stop. Then distance is given as,
v² - u² = 2as
0² - (10.3)² = 2 x (-5.6) x d
- 106.09 = -11.2d
d = 9.47 meters
The number of miles is 9.47 meters.
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An automobile tire has a volume of 0.0185 m 3 3 . At a temperature of 294 K the pressure in the tire is 212 kPa. How many moles of air must be pumped into the tire to increase its pressure to 252 kPa, given that the temperature and volume of the tire remain constant?
The number of moles of the air will be 1.6.
What is an ideal gas equation?The equation of state for a fictitious ideal gas is known as the ideal gas law, also known as the general gas equation. Although it has some restrictions, it is a good approximation of the behaviour of many gases under various circumstances.
Given that an automobile tire has a volume of 0.0185 m ³. At a temperature of 294 K, the pressure in the tire is 212 kPa.
Calculate the volume at pressure P₂,
P₁V₁ = P₂V₂
V₂ = ( P₁V₁ ) / P₂
V₂ = ( 212 x 0.0185 ) / 252
V₂ = 0.0155 m³
The number of the moles will be calculated as:-
PV = nRT
n = ( P₂V₂ / RT)
n = ( 252 x 0.0155 x 1000 ) / ( 8.3145 x 294 )
n = 1.6 moles
Therefore, there will be 1.6 moles in the air.
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You have learned how astronomers talk about huge astronomical distances. Based on what you learned, select all of the correct statements from the following list. a. The distances to stars are measured in light years. b. A light-year is larger than an astronomical unit.
c. Astronomers use the metric system for calculations.
The distances to stars are mainly measured in parsecs, a light-year is larger than an astronomical unit (AU), and for calculations, astronomers use the metric system. Therefore, B and C are the correct options.
The metric system refers to the international decimal system of measurement. Since it is used internationally, it is a good idea that scientists use the metric system as a standard system of measurement. Astronomy is a science, so astronomers do use the metric system, though they prefer units (such as astronomical units, light years, and parsecs) that describe very long distance since space is huge.
Astronomers use light years to measure the distances between stars. But to measure the distances (from Earth) to stars, astronomers prefer to use parsecs.
A light-year is much greater than an AU (astronomical unit). A light year is defined to be equal to 63,240 AU.
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A car traveling at 20 m/s reaches 60 m/s in 4 seconds traveling in a straight line. The car has an average acceleration of _______ m/s2.
The car has an average acceleration of 10 m/s²
The rate at which the velocity changes over time is referred to as the average acceleration. To determine the average acceleration, we take the change in velocity and divide it by the amount of time that has passed. Average acceleration is calculated by the following formula:
Δv ÷ Δt
where:
Δv = the change in velocity
= 60 m/s - 20 m/s
= 40 m/s
Δt = the total time over the velocity is changing
= 4 seconds
Thus, the average acceleration of the car would be:
Average acceleration = 40 m/s ÷ 4 s
= 10 m/s²
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What are the major energy transformations that occur between when energy starts from a primary energy source, becomes a piece of wood, which is then burned in a fire?
Sunlight to chemistry energy conversion, energy transfer as from sun to plants, kinetic energy is created by converting thermal energy. when wood is burned, mechanical energy is converted to thermal energy.
What are the primary six energy forms?Chemical, electrical, infrared, mechanical, thermal, et nuclear energy are the six main types of energy. Different research may focus on other forms, such as electric, acoustic, electromagnetic, and some others.
What is an indication of an energy revolution?Energy transition describes the change in the global energy industry away from fossil-based methods of hydropower, such as oil, natural gas, and coal, and toward rechargeable batteries with renewable sources of electricity like wind and solar.
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What is the current flowing through this circuit?
A) 1.3 A
B) 0.15 A
C) 15 A
D) 6.7 A
Answer:
6.7A
Explanation:
Firstly find out the net resistance,
in parallel combination of resistors,
R = R1 * R2 / R1 + R2
R = 6*2/6+2 Ω
R = 12/8Ω
R = 1.5 Ω
Now use Ohm's law,
v = iR
10 = i * 1.5
i = 10/1.5 A
i = 6.7 A
Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 2.00x10^4 m/s. What is the distance of closest approach?
The distance of closest approach is 6.9 x 10⁻¹⁰ m.
What is the distance of closest approach?
The distance of closest approach between two protons can be determined using the law of conservation of energy.
Since the protons are moving directly toward one another, the total energy of the system is the sum of their kinetic energy and their potential energy.
rf = ( kq² ) / (1/2mv²)
where;
k is coulomb's constantq is the charge of the protonv is the speed of the protonrf = ( 9 x 10⁹ x (1.6 x 10⁻¹⁹)² ) / (0.5 x 1.67 x 10⁻²⁷ x ( 2 x 10⁴)²)
rf = 6.9 x 10⁻¹⁰ m
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A man pushes a lawn mower on a level lawn with a force of 211 N. If 50% of this force is directed forward, how much work is done by the man in pushing the mower 5.7 m?
What is the net force (in N) of a 3.00 N force and an 8.00 N force acting on an object for each of the following conditions?
b) The forces act in the same direction.
A DC circuit with is driven by 12 volt supply and a DC load of 200 Ohms. Calculate I (Amps) and P (Watts). a. 720 A,60 W b. 2.4 mA,28.8 mW c. 60 mA,720 mW d. 12 A,200 W
A DC circuit with is driven by 12 volt supply and a DC load of 200 Ohms. 60 mA, 720 mW, so option (c) is correct.
What is circuit ?
A circuit is a closed circuit in which electrons can move. No electrons will move unless the circuit is complete, that is, it makes a complete circuit around the electrical source.
What is volt ?The volt is a unit of electrical potential, potential difference, and electromotive force in the metre-kilogram-second (SI) system. It is equal to the difference in potential between two conductor points carrying one ampere of current when there is a one-watt power loss between the points.
Voltage current x Resistance
V=IR
Putting the the given values in the above equations So,
12 = I x 200
Or
I = 12/200
I = 0.06A (here A stands for ampere which is unit of current) And we know that 1A = 10 mA (mA stands for milliampere} So
I = 0.06A = 0.06 x 10 mA = 60mA
I = 60mA [Answer]
Here we use the formula P = V x I, which is describe as follows. Power = Voltage x current
we put the values in the above equation
P = 12 x 60
P = 720mW [here mW is stands for milli watt which is unit of power} P=720mW [Answer]
Therefore, A DC circuit with is driven by 12 volt supply and a DC load of 200 Ohms. 60 mA, 720 mW, so option (c) is correct.
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is the vertical component of velocity ever zero? if so, where?
a. yes, it is zero at points a and e. b. yes, it is zero at all points.
c. yes, it is zero at point c. d. no, it is never zer
c. Yes, it is zero at point c. The vertical velocity component can become zero when the projectile reaches its maximum altitude.
At the highest point of the projectile, its vertical component is instantaneous before it changes direction and the object begins to fall under the influence of gravity.
What Is that projectile motionProjectile motion is motion with a curved path in the form of a parabola curve. Due to this curved trajectory, the projectile's motion is included in two-dimensional motion. The meaning of two-dimensional motion is that the motion of objects can be projected in horizontal and vertical directions.
In physics, in the horizontal direction, there is no force affecting it so that the object moves at a constant speed. Conversely, in the vertical direction, the gravitational force pulls the object down so that the object moves at a constant speed.
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1.If you looked back at Earth from the moon, what phase would Earth have when the moon was full? New? First quarter? Waxing crescent?
The phase that the Earth would have when the Moon was full if we looked from the moon would be new phase.
The Moon and Earth are both always partially lit by the Sun. However, from either world, you can see varied portions of that lighted half - or different phases of the Earth or moon - at any given time. The phases usually follow a pattern in which they are inverted relative or reversed to one another.
Any moon resident would see a narrow crescent Earth when the moon is nearly full. The moon, Earth, and sun form a line with Earth in the middle when we observe a full moon. The Earth would then be completely obscured by the sun's brightness, making it invisible to those on the moon. Therefore, the phase that the Earth would have looked from the Moon would be the new phase because the opposite of a full moon phase is a new moon.
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a scooter starts from rest and move's with a constant acceleration of 1 .2 metres squared determine the velocity, after it has traveled for 60 meters
It is possible to write - v = u + at, v = 0 +1.2 x 60, v = 72 m/s by using the first motion equation.
How do velocity and speed differ?Velocity is the pace and direction of such an item's movement, whereas pace is the time rate which an entity is travelling along a route.
A first equation of movement is given by Ms. Reitman's scooter velocity,
which accelerates at a rate of 1.2 m/s2 from rest.
The formula is: [a] = 2 m/s2 [t] = 60 s.
Thus, It is possible to write - v = u + at, v = 0 +1.2 x 60, v = 72 m/s by using the first motion equation.
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The activation energy, Ea, for a particular reaction is 37.8 kJ/mol. If the rate constant at 280 K is 0.178 M/s, what is the value of the rate constant at 457 K? (R = 8.314 J/mol K)
The value of the rate constant at 457 K is 0.478 M/s.
The rate constant, k, at a given temperature can be related to the activation energy, Ea, and the gas constant, R, through the Arrhenius equation:
[tex]k = Ae^{(-Ea/RT)}[/tex]
where A is the pre-exponential factor and T is the temperature in Kelvin.
Given k1 = 0.178 M/s at T1 = 280 K, and Ea = 37.8 kJ/mol, we can calculate the rate constant, k2, at T2 = 457 K as:
k2 = A * [tex]e^{(-Ea/R * T2)}[/tex] = 0.178 * [tex]e^{(-37.8 kJ/mol / (8.314 J/mol K) * 457 K)}[/tex] = 0.478 M/s.
This means that the reaction will proceed faster at 457 K than it does at 280 K, due to the increase in temperature leading to an increase in the rate constant, k.
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two waves having the same amplitude and frequency are traveling in the same medium. maximum destructive interference will occur when the phase difference between the waves is
If two waves having the same amplitude and frequency are traveling in the same medium. maximum destructive interference will occur when the phase difference between the waves is 180⁰.
The resultant amplitude of two waves with the same amplitude and frequency that collide while traveling in the same direction depends on the phase difference.
While there is no phase difference between two nodes, there is a 180⁰ phase variation between two antinodes.
The formula for the resulting amplitude caused by the superposition of two waves with a phase difference is:
A² = A1² + A2² + 2A1A2 cos ϕ
ϕ = 2π/3
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Find the principal stresses and corresponding principal directions for the stresses given in Problem 2.6. Check the result with other methods such as Mohr's circle.
The principal stresses and corresponding principal directions for the stresses in a problem can be found using various methods, one of which is Mohr's circle.
What is Mohr's circle?
Mohr's circle is a graphical representation of a two-dimensional stress state. Given the stress tensor components, the Mohr's circle can be used to visualize and determine the maximum and minimum normal stresses (i.e., the principal stresses) and the orientation of the planes on which they act (i.e., the principal directions).
It is important to note that finding the principal stresses and directions requires a thorough understanding of stress analysis, including stress transformation and the use of Mohr's circle. If you have access to the full problem statement, I would be happy to help you work through the solution.
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How much work is required to lift a 7.1-kg backpack 1.2 m to put it on?
Answer:
it requires approximately 83.5812 Joules of work to lift the 7.1-kg backpack 1.2 m.
Explanation:
The work done to lift the backpack can be calculated using the formula:
Work = Force x Distance x cos(theta)
where Force is the weight of the backpack, Distance is the height it is lifted, and theta is the angle between the direction of the force and the direction of the displacement.
The weight of the backpack can be calculated as:
Weight = mass x gravity
where mass is 7.1 kg and gravity is the acceleration due to gravity, which is approximately 9.81 m/s^2.
Weight = 7.1 kg x 9.81 m/s^2
Weight = 69.651 N
The distance the backpack is lifted is 1.2 m.
The angle between the direction of the force and the direction of the displacement is 0 degrees, since the force and displacement are in the same direction.
Therefore, the work done to lift the backpack is:
Work = 69.651 N x 1.2 m x cos(0°)
Work = 83.5812 Joules (J)
So, it requires approximately 83.5812 Joules of work to lift the 7.1-kg backpack 1.2 m.
The work required to lift a 7.1-kg backpack 1.2 meters is approximately 83.5 Joules. This is calculated using the physics equation for work, which is Work = Force x Distance, where Force is the weight of the object.
Explanation:In physics, the work done to lift an object is calculated by the equation Work = Force x Distance. The force required to lift an object is its weight, which is calculated by multiplying its mass by the gravitational acceleration (the approximate value is 9.8 m/s² on Earth).
So, to calculate the work done in lifting a 7.1-kg backpack 1.2 m, we would first calculate the force (or weight) required to lift the backpack: Force = Mass x Gravitational acceleration = 7.1 kg x 9.8 m/s² = 69.58 N.
Then we multiply this force by the distance the backpack is lifted: Work = Force x Distance = 69.58 N x 1.2 m = 83.5 Joules.
So the work required to lift the backpack is approximately 83.5 Joules.
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The oxygen molecule (O2) may be regarded as two masses connected by a spring. In vibrational motion, each oxygen atom alternately approaches, then moves away from the center of mass of the system. If each oxygen atom of mass m = 2.67 ´ 10-26 kg has a vibrational energy of 1.6 ´ 10-21 J and the effective spring constant is 50 N/m, then what is the amplitude of oscillation of each oxygen atom?
Answer:
2.5 × 10^-11 m
Explanation:
The amplitude of oscillation for a simple harmonic oscillator is given by the equation:
A = √(2E / k), where E is the vibrational energy of each oxygen atom and k is the effective spring constant.
Substituting the given values:
A = √(2 * 1.6 × 10^-21 J / 50 N/m)
A = √(3.2 × 10^-21 J / 50 N/m)
A = √(6.4 × 10^-23 m^2 kg / s^2)
A = 2.5 × 10^-11 m
The force F acts along line MA, where M is the midpoint of the radius along the x-axis. Determine the equivalent force-couple system at O if theta = 40 degrees
The opposing force that keeps an object from sliding downward or moving upward is called friction force. The object is prevented from moving in this experiment by the effects of gravity.
What three types of gravity are there?Gravity only comes in one variety. In nature, there is only one form of gravity. According to their masses and the separation between their centers, there is only one kind of gravitational pull that draws the two bodies together. Gravity is the weakest power known to exist in nature and is a form of central force.
What makes gravity a force?But in a wider sense, gravity is a force because it represents the interplay that happens when two masses are in close proximity to one another. the gravitational pull is.
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An electron is released from rest in a uniform electric field. Determine whether the following quantities increase, decrease, or remain unchanged as the electron moves. Indicate your answers with I (increase), D (decrease), or U (unchanged), respectively.a) The electric potential at the electron's locationb) The electron's associated electric potential energyc) Its kinetic energyd) Its total energy
As the electron moves in a uniform electric field, the following changes occur:
a) The electric potential at the electron's location decreases
b) The electron's associated electric potential energy decreases
c) Its kinetic energy increases
d) Its total energy remains unchanged.
This is because the potential energy is converted into kinetic energy as the electron moves from a higher potential location to a lower one. The total energy remains constant, as energy cannot be created or destroyed, only converted from one form to another.
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bernouli’s equation is only for fluids that have :
A- low viscosity, incompressible with turbulent flow
B- high viscosity, compressible and streamline flow
C- low viscosity, compressible and turbulent flow
D- low viscosity, incompressible and streamline flow
E- none of the above
Answer:Bernoulli developed his principle from observations on liquids, and Bernoulli's equation is valid for ideal fluids: those that are incompressible, irrotational, inviscid, and subjected to conservative forces.
Explanation:
What is the peak wavelength of light coming from a star with a temperature of 5300 K?
(Submit your answer in nanometers. Remember 1nm = 10-9 m)
The peak wavelength of light coming from a star with a temperature of 5300 K is 2.0 x 10⁻⁷ m.
What is wavelength?Wavelength is a measure of the distance between two consecutive wave crests or troughs and is usually defined as the length of one full cycle of a wave. Wavelengths are typically measured in meters, centimeters, or nanometers (10-9 meters). Wavelength is inversely related to frequency, meaning that higher frequency waves have shorter wavelengths.
The wavelength of each energy level can be calculated using the equation λ = hc/E, where h is Planck's constant, c is the speed of light, and E is the energy level in electron volts. Using this equation, the four wavelengths of the emission spectrum are calculated as follows:
0.0 eV = 0.0 m, 1.5 eV
= 8.0 x 10⁻⁷ m, 3.0 eV
= 4.0 x 10⁻⁷ m
and 6.0 eV =
2.0 x 10⁻⁷ m.
Thus, the peak wavelength of light coming from a star with a temperature of 5300 K is 2.0 x 10⁻⁷ m.
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a body of mass 10kg on a smooth inclined plane is connected over a smooth pulley to a mass of 15kg. acceleration of the system is?
The acceleration of the system is 4.9m/s² in the given pulley.
In a pulley, is acceleration equal?The most massive object will accelerate downhill and the least massive object will accelerate upward in a circumstance like this where two objects are strung above a pulley. Each object will experience the same amount of acceleration.
Acceleration has nothing to do with modifying the speed of an object. An object is not accelerating if its velocity remains unchanged. The data to the right show that an object moving towards the north does accelerate. The object's velocity is fluctuating over time.
In reality, the velocity changes by 10 m/s, or a constant amount, every second. An object is said to be moving faster or to have an acceleration whenever its velocity is changing.
ma = mg × sin30
a = g × sin30
a = 9.8 × sin30
a = 4.9m/s²
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runner traveling at 8 m/s begins to slow down by accelerating at --1 m/s2 for 4 seconds. without the acceleration the runner would have ran
Without acceleration, the distance is 32 m, and with acceleration, the distance is 24 m shorter.
Explain what acceleration is.The direction of the motion is shifting, therefore an object moving at a constant speed in a circular path is still moving forward.
Describe the acceleration law.Newton's Second Law of Motion states that when a force is applied to a material, the mass accelerated (gains speed) (object). Riding a bicycle is a great example of how this movement law is put to use. The bulk is made up by your bicycle. Your leg muscles produce the force as they push against with the bicycle's pedals.
Initial speed v = 8 m/s
acceleration a = -1 m/s²
t = 4 sec.
distance d = v * t
= 8 m/s * 4 sec.
d = 32 m
distance with acceleration,
d' = vt + 1/2 at²
d' = 8 m/s * 4s + 1/2 * (-1 m/s²) (4s)
d' = 24 m
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If the acceleration of an object is always directed perpendicular to its velocity, which of the following is true _____.a. this situation would not be physically possibleb. the object is slowing downc. the object is speeding upd. the object is turning
If the acceleration of an object is always directed perpendicular to its velocity, then the statement (the object is turning) is true due to the fact that the velocity vector of the object is always heading in a different direction.
The moving object is being accelerated in the direction of the center of rotation due to a centripetal force acting in that direction.
According to Newton's laws of motion, the path that the object would take if it did not experience this acceleration is a straight line.
An object's acceleration can be defined as the rate at which its velocity changes in relation to the passage of time. Accelerations are vector quantities. The orientation of the net force that is acting on an item is what determines the orientation of the acceleration the object is experiencing.
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A ball is dropped from the top of a 93-m-high building. What speed does the ball have in falling 3.3 s?
Answer:
32.34 m/s
Explanation:
refer to the attachment
hope this helps
As a result of the magnetic interaction between the soft iron and the bar magnet, which of the following will occur? Choose the correct answera) The magnet will experience a torque due to the iron attracting its north pole.
b) The magnet will experience a torque due to the iron attracting its south pole.
c) Whichever pole of the magnet is closest to the iron will be attracted to the iron.
d) Whichever pole of the magnet is closest to the iron will be repelled from the iron.
As a result of the magnetic interaction between the soft iron and the bar magnet, whichever pole of the magnet is closest to the iron will be attracted to the iron (option C)
A current-carrying solenoid creates its own magnetic field both inside and outside the solenoid when current is applied. The strength of the magnetic field inside the solenoid is increased when a soft iron bar or core is inserted because it magnetizes the iron bar.
The magnetic domains (small dipoles) present in the soft iron are aligned by the magnetic field of the bar magnet to produce the forces in this situation. It is possible to think of these domains as tiny perpetual current loops, and their propensity to align is known as permeability. The dipoles will be aligned to attract the pole of the bar magnet that is closest, and whichever pole of the bar magnet is nearest will dominate this alignment.
The question is incomplete, it should be:
A bar magnet oriented along the y axis can rotate about an axis parallel to the z axis. Its north pole initially points along j. Now the charge is replaced by an electrically neutral piece of initially unmagnetized soft iron (for example, a nail) that is not moving.
As a result of the magnetic interaction between the soft iron and the bar magnet, what will happen to the magnet?
Whichever pole of the magnet is closest to the iron will be attracted to the iron.
Choose the correct answer
a) The magnet will experience a torque due to the iron attracting its north pole.
b) The magnet will experience a torque due to the iron attracting its south pole.
c) Whichever pole of the magnet is closest to the iron will be attracted to the iron.
d) Whichever pole of the magnet is closest to the iron will be repelled from the iron.
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manually calculating the heat input or arc energy supplied to produce a weld is a method that can be used for which of the following? A.All of these
B. CC/CV
C. Pulse
D. AC (Alternating current)
Manually calculating the heat input or arc energy supplied to produce a weld is a method that can be used for CC/CV.
How do heat input and weld speed relate to one another?
As voltage, current, wire feed rate, or a combination of these, or all three, increase, more heat is applied to the weld metal. With an increase in welding speed, the heat input drops. As the heat input increases, the rate of cooling of the weldment reduces.
Before the process efficiency is taken into account, arc energy is the energy that the welding arc supplies to the workpiece. The following equation can be used to compute it: where: The voltage, expressed in volts, is V. I represents the used current in amperes.
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A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2.00 m/s2 and feelsno air resistance. The upward thrust force its engines must provide during this acceleration is closest toA) 20,000 N.B) 980,000 N.C) 118,000 N.D) 78,000 N.
The upward thrust force of rocket engines must provide is 118,000 N (C)
At the precise moment of launch, the force pushing upwards and the weight acting downwards are the two forces that are acting on rockets. At the surface of the Earth, the force exerted by gravity is referred to as weight, and it may be determined by multiplying the mass in kilograms by 9.8 m/s². The upward thrust force can be calculated by this following formula:
F = m × (a +g)
Where:
F = the upward thrust force
m = the mass of the object
= 10,000 kg
g = the acceleration due to gravity
= 9.8 m/s²
a = the uniform upward acceleration
= 2 m/s²
Thus, the upward thrust force of rocket engines must provide is
F = 10,000 × (2 + 9.8)
= 118,000 Newton
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